You added 12 drives? How many drives were in your system prior to adding drives to it?
I want to make sure that you have done the following steps in this order.
Once the rebalances finishes then you should see the new space on the tier.
i think i had done all the step, but the Rebalance RAID progress very long time, i had wait that for 2 week, and it still show 99%
so, i stop it, and should me click ok shown in pic?
I am going to send you a private message, & if you can enable secure console and provide me with your controller serial# so I can look into your system.